On small signal capacitance spectra of organic diode formed by ITO–palladium phthalocyanine–Al sandwich system

Jarosz, G.

doi:10.1016/j.tsf.2009.12.106

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…The assignment of the bands in the vibrational spectra of PdPc and PdPcF 16 has already been published in our previous work [16], however, the vibrational spectra of PdPcF 4 The modes below 200 cm -1 belonging to the lattice vibrations [43] are also dependent on phase composition and molecular packing. The bands at 57, 127, 163 cm -1 are observed in the spectrum of PdPcF 4 films deposited on a cold substrate, whereas in the case of the film deposited on a hot substrate these bands are located at 52, 78, 173 cm -1 .…”

Section: Spectral Studymentioning

confidence: 83%

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Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

et al. 2018

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In this work, the crystalline structure of single crystals grown by vacuum sublimation of unsubstituted palladium phthalocyanines (PdPc), its tetrafluorinated (PdPcF 4) and hexadecafluorinated (PdPcF 16) derivatives have been investigated using X-ray diffraction measurements. Two crystalline phases have been identified for PdPc; the molecules in both phases crystallize in stacks with herringbone arrangement in the monoclinic space groups (C2/c for -PdPc; P2 1 /n for -PdPc). Both PdPcF 4 and PdPcF 16 crystallize in the triclinic P-1 space group, forming stacks of molecules in columnar arrangement with molecules in adjacent columns are aligned parallel to one another. X-ray diffraction measurements have also been used to elucidate the structural features and molecular orientation of thin films of PdPc, PdPcF 4 and PdPcF 16 , grown by organic molecular beam deposition at different substrate temperatures. The effect of fluorosubstitution on UV-visible optical absorption and vibrational spectra of palladium phthalocyanine derivatives is also discussed.

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Section: Spectral Studymentioning

confidence: 83%

“…This renders them as promising compounds for photovoltaic applications [3][4]. Besides, thin films of palladium phthalocyanine have good sensing properties for different gaseous analytes, with fast response times, high base line stability and enhanced sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

et al. 2018

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“…3 This property as well as the strong absorption within the visible spectral range makes PdPc films a quite useful candidate for photovoltaic applications. 4,5 Thin films of palladium phthalocyanine have also demonstrated good sensing properties for different gaseous analytes, with fast response times, high baseline stability, and enhanced sensitivity. Recent studies showed that films of PdPc can be used as active layers of chemical sensors for the determination of humidity, 6 oxygen, 7 ammonia, and NO 2 .…”

Section: Introductionmentioning

confidence: 99%

Thin Films of Unsubstituted and Fluorinated Palladium Phthalocyanines: Structure and Sensor Response toward Ammonia and Hydrogen

et al. 2017

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In the present work, we study and compare the structure and sensing properties of thin films of unsubstituted palladium phthalocyanine (PdPc) and hexadecafluorosubstituted palladium phthalocyanine (PdPcF 16 ). Thin films of PdPc and PdPcF 16 were obtained by the method of organic molecular beam deposition and their structure was studied using UV-visible spectroscopy, X-ray diffraction and atomic force microscopy techniques. The electrical sensor response of PdPc films toward ammonia and hydrogen was investigated and compared with that of PdPcF 16 films. The nature of interaction between the phthalocyanines films and some gaseous analyte molecules has been clarified using Quantum chemical (DFT) calculations.

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“…Palladium phthalocyanine (PdPc; C 32 H 16 N 8 Pd; M = 618.94 g·mol –1 ) is a p‐type phthalocyanine with a hole mobility equal to 2.5 × 10 –5 cm 2 /(Vs) . PdPc exhibits longer diffusion length in comparison with ZnPc and CuPc; this feature makes PdPc quite attractive for photovoltaic applications . By contrast to other MPcs (especially CuPc and ZnPc), few studies have been carried out on PdPc as an active material to fabricate gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

Jafari¹,

Azim-Araghi²,

Barhemat³

et al. 2012

Surface & Interface Analysis

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aThe effect of post-deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine (PdPc) nanostructured thin films has been studied. PdPc thin films were deposited on polyborosilicate substrate by thermal evaporation technique at room temperature. The surface morphology of thin films was investigated by SEM, X-ray diffraction, and optical absorption. X-ray diffraction patterns showed a phase transition from a to b based on post-deposition annealing at temperatures above 200 C. The SEM and optical absorption confirmed that annealing strongly influenced the surface morphology of nanostructured thin films. Sandwich devices (Au|PdPc|Al) were fabricated and exposed to different concentrations of NO 2 and NH 3 as oxidizing and reducing gases at different temperatures, and the sensitivity of devices were obtained versus gases. Obtained results showed a-PdPc thin film devices had higher sensitivity in comparison with devices in b-phase. In particular, it was found that the sensitivity of devices is temperature dependent and the best operating temperature range of devices was measured at about 90-100 C. Devices showed good reversibility, response, and recovery time at room temperature. Finally, the stability of sensors was investigated for a period of about 1 year; results showed that the sensors were stable for 2 months and lost about 30% of their sensitivity after 1 year.

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On small signal capacitance spectra of organic diode formed by ITO–palladium phthalocyanine–Al sandwich system

Cited by 8 publications

References 29 publications

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

Thin Films of Unsubstituted and Fluorinated Palladium Phthalocyanines: Structure and Sensor Response toward Ammonia and Hydrogen

Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

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